The temperature and humidity charts could display (historical) data from Yr for outdoor temperature and humidity. Not sure how valuable this is, so this is experimental. One obvious thing to look for is when too-low indoor temperature correlates with low outdoor temperature (poor heating) or too-high with high (poor cooling). Humidity less clear, but there are probably similar correlations to look for.
The temperature and humidity charts could display (historical) data from Yr for outdoor temperature and humidity. Not sure how valuable this is, so this is experimental. One obvious thing to look for is when too-low indoor temperature correlates with low outdoor temperature (poor heating) or too-high with high (poor cooling). Humidity less clear, but there are probably similar correlations to look for.